zfs discuss - Sep 2008 - RFE: allow zfs to interpret ''.'' as da datatset?

Hi,

I''d like to be able to utter cmdlines such as

$ zfs set readonly=on .
$ zfs snapshot . at now

with ''.'' interpreted to mean the dataset corresponding to
the current working directory.

This would shorten what I find to be a very common operaration -
that of discovering your current (working directory) dataset
and performing some operation on it.  I usally do this
with df and some cut and paste:

(gavinm at hyper:fx-review/fmaxvm-review2/usr/src/uts )-> df -h .
Filesystem             size   used  avail capacity  Mounted on
tank/scratch/gavinm/fx-review/fmaxvm-review2
                        1.0T    15G   287G     5%   
/tank/scratch/gavinm/fx-review/fmaxvm-review2

(gavinm at hyper:fx-review/fmaxvm-review2/usr/src/uts )-> zfs set readonly=on
tank/scratch/gavinm/fx-review/fmaxvm-review2

I know I could script this, but I''m thing of general ease-of-use.
The failure semantics where . is not a zfs filesystem are clear;
perhaps one concern would be that it would be all to easy to
target the wrong dataset with something like ''zfs destroy .'' -
I''d
be happy to restrict the usage to non-destructive operations only.

Cheers

Gavin

On Mon, 1 Sep 2008, Gavin Maltby wrote:
> I''d like to be able to utter cmdlines such as
>
> $ zfs set readonly=on .
> $ zfs snapshot . at now
>
> with ''.'' interpreted to mean the dataset corresponding to
the current
> working directory.
Sounds like it would be a useful RFE.
> This would shorten what I find to be a very common operaration - that of 
> discovering your current (working directory) dataset and performing some 
> operation on it.  I usally do this with df and some cut and paste:
There''s an easier way: the zfs list command can take a pathname
argument
and, by using some options, you can filter the output:

 	cur_datset="$(zfs list -Ho name $(pwd))"


Regards,
markm